Frequently Asked Questions

Wenzhou Sanhui Machinery Manufacturing Co., Ltd., founded in Wenzhou in 2014, is a specialized machinery manufacturer focusing on the R&D, production, sales, and customized solutions of slitting machines. With over 12 years of manufacturing experience, a 2,500m² factory, and 20+ equipment technicians, we have become a trusted slitting solution provider exporting to 60+ countries worldwide.

We mainly produce the following categories of machinery:

• Slitting Machines — Vertical, horizontal, gantry, ground roller, automatic roll change, and aluminum foil models (Model 320 to 3500mm width)
• Cross-Cutting Machines — SHHQ cross-cutter and mineral water label cutting machine
• Inspection Machines — SHJP-C multi-functional roll inspection machine with CCD vision
• Rewinding Machines — Shaftless (SHFJ-C), single shaft (SHDZ-FJ), and automatic roll change (DZFJ-M) rewinders
• Edge Trim Winders — SHFB and SHFB-PT waste edge collection machines
• Clamshell Machines — SHHZ palm folding machine for PVC/PET shrink films
• Adhesive/Laminating Machines — SHTH-A multifunctional laminating and slitting machine

Our factory covers 2,500m² with 20+ equipment technicians. We offer a full product line from Model 320 to 3500mm slitting width, covering self-adhesive materials, horizontal/vertical types, and hot/cold cutting configurations. Every machine undergoes comprehensive testing for function, durability, and safety before leaving our facility.

All our machines are CE certified and comply with international safety and electrical standards. We maintain strict quality control throughout the entire production process, from design drawings to final factory commissioning.

Our factory is located at: 1st Floor, Building B17-8, Machinery Industrial Park, Light Industry Production Base, Wanquan Town, Pingyang County, Wenzhou, Zhejiang Province, China 325400

Vertical Slitting Machines adopt a vertical layout with compact design and small floor space. They are ideal for medium and narrow width roll materials, small-to-medium batch production, and workshops with limited space.

Horizontal Slitting Machines use a horizontal structure designed for large-diameter, heavy-weight, and wide-format master rolls. They provide natural stability for heavy rolls, support up to 1600mm unwind diameter, and are ideal for 24/7 continuous industrial production.

Key factors: available floor space, roll weight/diameter, material type, and production volume.

A slitting machine performs longitudinal cutting — it splits a wide master roll into multiple narrower continuous rolls (roll-to-roll). It cuts parallel to the material running direction using spaced rotary circular knives.

A cross-cutting machine performs transverse cutting — it cuts web materials into fixed-length flat sheets perpendicular to the feeding direction. It produces separate sheet products rather than coiled rolls.

Automatic roll change slitters are recommended when:

• You run 24/7 continuous production with large order volumes
• You want to reduce labor costs — one operator can supervise multiple machines
• You need 100%+ efficiency improvement over standard slitters
• Your ROI horizon is 12-18 months for high-volume operations

Though 120-130% more expensive than standard slitters, the investment pays back through doubled output and substantial labor savings.

The gantry (bridge-style) frame provides superior rigidity for ultra-wide roll processing (wider than 2000mm). Standard frames can flex at extreme widths, compromising precision. The gantry design maintains +/-0.1mm accuracy even on the widest rolls, making it the preferred choice for industrial-scale operations processing packaging film, photovoltaic backsheet films, electrical insulation materials, and large-format paper converting.

A ground roller slitting machine uses a ground-level roller feed structure. It is a practical, cost-effective solution with simple layout, stable material transport, and no complex foundation construction required. It is an excellent choice for businesses seeking reliable slitting performance without the higher investment of gantry or automatic models.

Sanhui provides a full range from Model 320 to 3500mm slitting width. Common standard widths include: 1100mm, 1300mm, 1600mm, and 1800mm. Custom widths can be discussed with our engineering team based on your master-roll width and finished-roll size requirements.

A slitting machine converts a large master roll into multiple narrower finished rolls through four main stages:

1. Unwinding — The jumbo roll is mounted on an unwinder with tension control (magnetic powder brake or servo) to prevent slack, stretching, or wrinkling.
2. Guiding & Tension Control — An EPC (Edge Position Controller) and guide rollers keep the web centered. Closed-loop tension control ensures consistent flatness.
3. Slitting — The material is cut into strips using rotary shear knives (for paper, film, foil — clean, burr-free edges) or razor blades (for thin films and non-wovens).
4. Rewinding — Slit strips are rewound onto independent air-expanding shafts with individual tension control for uniform winding density.

EPC (Edge Position Control) correction accuracy is typically +/-0.1mm on our machines. This ensures the material stays centered during high-speed slitting, preventing edge deviation and ensuring straight, clean cuts. Some models feature dual CCD and ultrasonic web guiding for even greater precision on ultra-thin materials.

Maximum speeds vary by model:

• Standard vertical/horizontal slitters: 200-400 m/min
• High-speed models (SHLB-C, SHM-S): up to 600 m/min
• Adhesive/laminating slitters: up to 700 m/min
• Automatic roll change slitters: up to 500-600 m/min with non-stop production

We offer three main slitting methods depending on material characteristics:

• Rotary Shear Slitting — Two counter-rotating circular knives shear the material. Produces clean, dust-free cuts. Ideal for paper, film, foil, and composite materials.
• Razor Slitting — A sharp fixed blade slices thin materials at high speed. Suitable for thin films, release films, and non-wovens.
• Crush Cut Slitting — An anvil roller squeezes the material. Suitable for softer, easily adhesive materials such as foam.

Aluminum foil slitters use high-speed steel (HSS) circular shear blades with precise gap settings for burr-free cuts on 6-30 micron foils.

The minimum slitting width depends on the machine model and blade configuration. Our surface curling slitters (SHBM-JQ) can achieve minimum widths as narrow as 5mm for ultra-narrow strip production. Adhesive/laminating slitters can achieve minimum widths of 3mm for high-precision electronic applications.

Shafted unwinding uses an air-expanding shaft that passes through the core of the roll. It is simpler and more economical for standard roll sizes.

Shaftless unwinding uses hydraulic or pneumatic chucks that grip the roll from both sides without a shaft through the core. It enables faster roll changes (up to 50% time savings), handles heavier rolls (up to 1000-3000kg+), and is ideal for large-diameter master rolls.

Our machines are equipped with Siemens PLC control systems with touch screen HMI (Human-Machine Interface). Features include automatic meter counting, residual material detection and alarm, fixed-length auto stop, real-time operation monitoring, and fault alarms. The system supports formula storage, data monitoring, and one-click recall for repeat jobs.

Aluminum foil is extremely thin (typically 6-30 microns), fragile, and sensitive to tension variations. Standard slitters can stretch, wrinkle, or tear the foil. A specialized foil slitter has:

• Advanced constant-tension control system calibrated for thin metal foils
• HSS (high-speed steel) circular shear blades for clean, burr-free cuts
• CCD and ultrasonic dual web guiding for +/-0.1mm correction accuracy
• Hydraulic shaftless unwinding for safe handling of large foil rolls

Yes. Our aluminum foil slitting machines are also configured for electronic copper foil used in lithium battery current collectors, flexible printed circuits, and electromagnetic shielding. We adjust tension parameters and blade gap based on your specific foil type and thickness.

The machine handles:

• Double-zero foil (6-9 microns) — pharmaceutical PTP, food packaging
• Single-zero foil (10-30 microns) — household foil, industrial applications
• Laminated aluminum foil — composite packaging
• Carbon-coated aluminum foil — lithium battery current collectors
• Electronic copper foil — PCB, battery, shielding

Our machines use high-speed steel circular shear blades with precise gap settings optimized for each foil thickness. Combined with the constant-tension system that prevents material flutter, this delivers consistently burr-free edges ready for downstream processing such as printing, laminating, and die-cutting.

The SHLB-C aluminum foil slitter achieves +/-0.05mm burr-free shear cut precision with EPC correction accuracy of +/-0.1mm (CCD and ultrasonic dual guide). Maximum operating speed is 600 m/min.

Rewinding machines are mainly used to rewind large rolls into smaller rolls or rolls of specific specifications. They also handle edge trimming, defect inspection, and roll repair. Widely used in printing, packaging, paper making, and flexible packaging industries for materials including woodfree paper, coated paper, kraft paper, silicone paper, aluminum foil, PVC, plastic film, and insulation materials.

Our high-speed rewinding machines achieve a maximum rewinding speed of 600 m/min, with stable operating speeds of 400-600 m/min depending on material type and thickness.

Uneven rewinding may be caused by improper paper core installation, faulty web guiding system, or inclined pressure roller.

Inconsistent tightness may be caused by unstable tension control or inaccurate roll diameter detection.

Solutions:

1. Ensure the paper core is installed firmly and centered
2. Calibrate the web guiding (EPC) system
3. Adjust the horizontal position of the pressure roller
4. Check the roll diameter detection device and tension control system

• SHFJ-C — Fully shaftless unwind/rewind design for integrated edge trimming, rewinding, and defect inspection. Heavy-duty, versatile.
• SHDZ-FJ — Single shaft design for paper, film, and label rewinding with edge trimming and defect inspection. Compact and economical.
• DZFJ-M — Single shaft with automatic roll change for continuous production. Supports rewinding, trimming, slitting, and automatic roll changing.

Our inspection machines use a high-definition CCD visual inspection system that can detect various defects including:

• Registration deviation (misregistration)
• Color difference / color deviation
• Missing print
• Dirt spots and stains
• Scratches and surface defects
• Air bubbles and holes (pinholes)
• Edge damage and edge burrs

Detection accuracy reaches 0.1mm. The system automatically marks or separates defective positions, avoiding delivery of defective rolls to buyers.

Standard inspection machines reach 300 m/min, and high-speed models can reach 400 m/min.

Yes. Our inspection machines support online operation with slitting machines and rewinding machines, realizing integrated production of inspection, slitting, and rewinding. This greatly improves production efficiency and reduces manual intervention.

Built-in online visual inspection runs inline during unwinding-slitting-rewinding, automatically spotting missing print, color deviation, scratches, pinholes, misregistration, stains, and edge burrs. Flawed positions are automatically marked or separated, avoiding defective rolls delivered to buyers and cutting after-sales complaints and return losses.

A cross-cutting machine (also known as a cut-to-length machine or sheeter) cuts full-width web materials horizontally into uniform flat sheets perpendicular to the feeding direction. Unlike slitting rewinders that produce rolls, this machine produces separate sheet products. Widely applied in packaging printing, carton manufacturing, gift box processing, and label sheet production.

Available for various materials including coated paper, cardboard, composite film, plastic sheet, aluminum composite sheet, self-adhesive labels, PET composites, color-printed composites, and printed packaging stock.

It is a high-precision cutting device customized for mineral water bottle labels, including PVC/PET heat shrink films and self-adhesive labels. It accurately cuts rolled label materials into individual finished products at set lengths, compatible with high-speed sleeve labeling and labeling lines.

The edge trim winder serves as the "cleaner" and "safety guard" on a web converting production line. It handles edge trim waste at high speed in a neat, automatic manner, ensuring production continuity while improving operational safety and housekeeping. If your slitting process generates trim waste that scatters around the equipment, an edge trim winder is highly recommended to maintain a clean and safe production environment.

The trim winder runs synchronously with the main production line, reaching maximum speeds of 500-600 m/min, fully capable of matching the pace of high-speed production lines.

High-quality trim winders utilize precision pineapple pattern winding technology, which causes the trim to form a regular, interleaved pattern on the winding shaft rather than simply layering flat. This prevents the trim roll from developing a tapered shape or side collapse, ensuring a tightly wound roll that is easy to handle and transport.

The standard warranty period is 12 months from the date of equipment acceptance. Common wearing parts include slitting blades (circular knives, razor blades), tension control components (magnetic powder brakes, servo belts), air-expanding shafts, guide rollers, and EPC correction sensors. Replacement cycles vary by usage intensity and material type — typically blades need replacement every 3-6 months under continuous production.

Clamshell machines are mainly used to bond printed film rolls with glue to make various specifications of composite bags, packaging bags, and handbags. The SHHZ palm folding machine is special production equipment dedicated to PVC and PET shrink films, processing sheet-shaped shrink films into roll-type tubular packaging materials through gluing, laminating, pressing, and shaping.

Our high-speed clamshell machine can reach a maximum sealing speed of 200 m/min, with a stable running speed of 150-180 m/min.

Unfirm sealing may be caused by insufficient glue concentration, insufficient glue application, or insufficient drying temperature.

Air bubbles may be caused by uneven glue application or insufficient pressure roller pressure.

Solutions:

1. Adjust glue concentration and application amount
2. Increase drying temperature appropriately
3. Increase pressure roller pressure and ensure the rollers are parallel

An adhesive slitting machine integrates laminating and slitting in one equipment. It bonds two or more rolls of film, paper, aluminum foil, or non-woven fabric into composite materials, then cuts wide master rolls into multiple narrow finished coils. Widely used in adhesive label, food packaging, electronic insulation, and non-woven material processing.

A solventless laminating machine (solvent-free laminator) is core flexible packaging processing equipment that bonds two or multiple roll substrates with 100% solid two-component PU adhesive (AB glue) — no solvent evaporation, making it environmentally friendly and energy-efficient.

• High Integration — Combines laminating and slitting into one machine, saving equipment costs and factory space
• Quality Protection — Avoids wrinkles, contamination, or stretching that occur when transferring materials between separate machines
• Precise Tension Control — Independent tension control for each layer prevents warping or tunneling in multi-layer composites
• High Speed — Up to 700 m/min for industrial film applications
• High Precision — Slitting width tolerance within +/-0.1mm, minimum width 3mm

The SHTH-A is suitable for laminating a wide range of materials including flocked fabric, solar backsheet, PET, PVC, plastic film, and insulating materials. It delivers firm bonding and smooth lamination for deep processing of various materials.

The SHM-S turret has four pneumatic friction rewind shafts arranged in pairs. While two shafts are actively winding finished rolls, the other two are in standby position. When the active rolls reach target diameter, the turret rotates 180 degrees, automatically splicing the film to the new shafts and cutting the finished rolls — all without stopping the machine.

Production efficiency increases by 100%+ (doubles) compared to standard slitting machines by eliminating downtime for manual roll changes. The four-axis turret structure can increase daily output by 30-40% compared to single-shaft slitters. One operator can supervise multiple machines running in auto mode.

Though 120-130% more expensive than standard slitters, the investment typically pays back within 12-18 months for high-volume operations through doubled output and substantial labor savings. Ideal for 24/7 continuous production with large order volumes.

• Automatic finished roll change and new core insertion
• Automatic material splicing when unwinding roll runs out
• Automatic blade change for rewinding shafts
• Automatic slitting cut after rewinding
• Automatic roller pressure regulation
• Automatic finished roll unloading
• Intelligent laser core positioning
• Self-adaptive unwinding width adjustment

Constant-tension control uses a closed-loop servo system that monitors and adjusts unwinding tension in real time. It maintains consistent tension throughout unwinding, slitting, and rewinding to prevent material stretching, deformation, wrinkling, and deviation. This is especially critical for thin and delicate materials like aluminum foil (6-30 microns), plastic films, and non-woven fabrics.

Manual slitting rewinder: Operators manually set slitting width, adjust tension, calibrate knife clearance, count length, and stop the machine. Mostly small-speed, low-cost equipment for small-batch trial production.

Automatic slitting rewinder: PLC-controlled with auto meter counting, auto stop at preset length, residual material alarm, EPC web guiding, automatic roll change, and continuous production. Dramatically reduces labor and improves consistency for mass production.

A high-speed slitter performs longitudinal cutting parallel to the material running direction with spaced rotary circular knives, splitting one wide master roll into multiple narrow continuous strips during roll-to-roll unwinding and rewinding.

A cross-cutter performs transverse cutting perpendicular to the feeding direction, producing separate flat sheets of fixed length rather than coiled rolls.

Horizontal slitters:

• Horizontal structure for large-diameter, heavy rolls (up to 1600mm unwind, 1500-3000kg+)
• Low center of gravity for stable high-speed running
• Easy roll loading — no high-altitude hoisting required
• Handles thick paper, thick film, and rigid foil that vertical slitters cannot

Vertical slitters:

• Compact vertical layout, small floor space
• For medium and narrow width rolls
• Simpler mechanical tension system
• Ideal for multi-variety, small-batch production

All machines include:

• Complete safety guards and enclosures
• Emergency stop buttons at operator stations
• Automated emergency systems that detect and respond to operational hazards
• CE-compliant electrical systems
• Dust extraction systems (especially for foil slitting)
• Automatic web break detection and alarm

Our machines handle a wide range of roll materials including:

• Paper: kraft paper, coated paper, offset paper, PE-coated paper, silicone paper, white cardboard, thermal paper, art paper, straw paper, masking paper
• Plastic films: BOPP, PET, PVC, PE, CPP, cellophane, metallized film, composite film, stretch film, shrink film
• Metal foils: pure aluminum foil (6-30 microns), laminated foil, carbon-coated foil, copper foil
• Non-woven fabrics: lightweight non-woven materials for packaging and hygiene
• Adhesive materials: self-adhesive labels, stickers, double-sided tape, barcode labels
• Other: insulation materials, electronic materials, optical films, lithium battery separator

Our machines serve diverse industries:

• Packaging: food packaging film, pharmaceutical packaging, daily chemical packaging, composite flexible packaging, vacuum packaging, heat shrinkable film
• Printing & Paper: cultural paper, label base paper, receipt paper, ticket paper for printing houses and paper processing factories
• Adhesive labels: adhesive base paper, label face material, sticker raw rolls, barcode and anti-counterfeiting labels
• Plastic film: BOPP, PET, PE, PVC, CPP for film manufacturers and converters
• Aluminum foil & metal foil: food foil, pharmaceutical PTP foil, battery current collector foil, cable shielding foil, household kitchen foil
• Electronics: thermal management, battery foils, electronic insulation materials
• New energy: lithium battery separator, solar backsheet films, composite materials

Yes. Our horizontal slitters are particularly well-suited for thick paper, thick film, and rigid aluminum foil that are difficult to process on vertical slitters. The horizontal structure provides natural stability for heavy and rigid materials. For ultra-thin and delicate materials, our specialized foil and film slitters with constant-tension control ensure gentle handling without stretching or wrinkling.

Prices vary significantly based on model, working width, configuration, and customization level. Our machines range from tens of thousands to hundreds of thousands of USD. We provide detailed quotations based on your specific technical requirements. Contact us with your material type, master-roll width, finished-roll size, and target output for an accurate quote.

Yes. If you purchase multiple units at one time or establish long-term cooperation, we offer certain discounts. The exact discount depends on order quantity and the specific models selected.

1. Consultation — Send your material sample, master-roll width, finished-roll size, and target output
2. Quotation — We provide a detailed quotation with technical specifications
3. Contract — Sign the official sales and purchase contract
4. Deposit — 40% deposit to initiate production schedule
5. Design & Manufacturing — 3 working days for drawings, then full production process
6. Inspection — Complete machine inspection video sent for remote acceptance, or on-site factory inspection
7. Balance Payment — 60% balance after inspection approval
8. Shipment — Fumigation-free wooden box packaging and shipment
9. Installation — On-site installation, commissioning, and training

Yes. You can bring your materials to our factory for free sample cutting. We will recommend the most suitable equipment based on the cutting results and demonstrate the machine's performance with your actual materials.

Standard payment terms: 40% deposit upon contract signing to initiate production, and 60% balance after machine inspection and before shipment. Other payment arrangements can be discussed for long-term partners.

• Standard models: 15-30 days
• Customized models: 30-60 days

Exact delivery time is subject to contract agreement and depends on the complexity of customization required.

Yes. Our equipment is exported to 60+ countries and regions worldwide. We provide complete export services including:

• Customs declaration
• Sea freight arrangement
• Installation and commissioning at destination
• Overseas after-sales support

The slitting machine is professionally packed in international export standard fumigation-free solid wooden boxes with moisture-proof, shockproof, and anti-collision protection. This ensures safe transportation worldwide and complies with customs clearance requirements of all countries.

Yes. After final inspection, we send a complete machine inspection video covering equipment operation, slitting effect, and parameter debugging for remote acceptance. Customers are also welcome to visit our factory for on-site inspection and direct performance verification.

The standard warranty period is 12 months from the date of equipment acceptance and signing of the acceptance document. During the warranty period, we provide free repair or replacement for manufacturing defects. After warranty expiration, we provide lifelong technical support and original spare parts supply.

Yes. After the equipment arrives at your factory, we dispatch professional technicians to complete on-site installation, commissioning, and trial production, ensuring normal operation and qualified slitting accuracy before handover.

Yes. On-site training is provided for customer operators covering:

• Machine operation and parameter setting
• Daily maintenance procedures
• Troubleshooting common issues
• Safety protocols

After training and acceptance, the acceptance document is signed to complete official handover.

Our engineers can remotely diagnose machine issues via the remote monitoring system. If on-site repair is needed, we provide service within 72 hours. We also offer 24/7 remote monitoring option for real-time troubleshooting and optimization.

Yes. We maintain a comprehensive OEM-certified spare parts inventory. No matter what problems customers face, we can quickly locate and supply the needed parts to ensure normal operation of the machine. We use only high-quality, manufacturer-approved components for long-lasting performance and perfect compatibility.

Yes. We offer comprehensive maintenance and safety solutions including:

• Predictive maintenance protocols — Advanced diagnostics to anticipate and prevent potential mechanical issues
• 24/7 remote monitoring — Real-time monitoring for troubleshooting and optimization
• Customized operator training — Tailored programs to safely and efficiently operate machinery
• OEM-certified spare parts — Manufacturer-approved components for perfect compatibility

Our 6-stage manufacturing process ensures quality at every step:

1. Design — Engineering department completes all production drawings within 3 working days
2. Parts Processing — Incoming inspection, precision finishing at in-house machining center, pretreatment
3. Surface Treatment — Wall panel frame assembly, professional baking paint, quality inspection
4. Assembly & Commissioning — Complete machine assembly, internal acceptance, no-load and load test runs
5. Inspection & Packaging — Customer inspection, balance payment, fumigation-free wooden box packaging
6. Installation & Handover — On-site installation, commissioning, training, and warranty service